No, there's no internal battery in the M13. The early PODs had that, but they were using a different type of memory. But, anyway, when you say "loses presets", what exactly do you mean? Do you have named presets that aren't there when you turn it on?

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"It is not our duty to understand the arbitrary, meaningless dictates of machines"

Are you sure you're not accidentally switching folders? There are four folders - 4 sets of 12 - and each folder contains the same 12 scenes when the unit comes from the factory. I've actually seen this same question asked before, and it turned out that the person was changing folders and not realizing it.

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"It is not our duty to understand the arbitrary, meaningless dictates of machines"